fix some errors

dev/full/index.html

@@ -25,7 +25,7 @@
 	<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery.maskedinput/1.4.1/jquery.maskedinput.js"></script>
 	<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/ion-rangeslider/2.1.4/js/ion.rangeSlider.js"></script>
 	<!-- Vanilla libs -->
-	<script type="text/javascript" src="https://rawgit.com/monterail/vue-multiselect/2.0/lib/vue-multiselect.min.js"></script>
+	<script type="text/javascript" src="https://unpkg.com/vue-multiselect@2.0.0-beta.13"></script>
 	<script type="text/javascript" src="https://rawgit.com/nosir/cleave.js/master/dist/cleave.min.js"></script>
 	<script type="text/javascript" src="https://nosir.github.io/cleave.js/lib/cleave-phone.i18n.js"></script>
 	<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/noUiSlider/9.0.0/nouislider.js"></script>

src/fields/fieldDateTimePicker.vue

@@ -48,7 +48,7 @@
 
 		mounted() {
 			this.$nextTick(function () {
-				if ($.fn.datetimepicker) {
+				if (window.$ && window.$.fn.datetimepicker) {
 					$(this.$el).datetimepicker(defaults(this.schema.dateTimePickerOptions || {}, {
 						format: inputFormat
 					}));
@@ -59,7 +59,7 @@
 		},
 
 		beforeDestroy() {
-			if ($.fn.datetimepicker){
+			if (window.$ && window.$.fn.datetimepicker){
 				$(this.$el).data("DateTimePicker").destroy();
 			}
 		}		

src/fields/fieldMasked.vue

@@ -11,7 +11,7 @@
 
 		mounted() {
 			this.$nextTick(function () {
-				if ($.fn.mask) {
+				if (window.$ && window.$.fn.mask) {
 					$(this.$el).unmask().mask(this.schema.mask, this.schema.maskOptions);
 				} else {
 					console.warn("JQuery MaskedInput library is missing. Please download from https://github.com/digitalBush/jquery.maskedinput and load the script in the HTML head section!");
@@ -20,7 +20,7 @@
 		},
 
 		beforeDestroy() {
-			if ($.fn.mask)
+			if (window.$ && window.$.fn.mask)
 				$(this.$el).unmask();
 		}	
 	};

src/fields/fieldRangeSlider.vue

@@ -18,7 +18,7 @@
 
 		watch: {
 			model: function() {
-				if ($.fn.ionRangeSlider) {
+				if (window.$ && window.$.fn.ionRangeSlider) {
 					let valueFrom, valueTo;
 					if (isArray(this.value)) {
 						[ valueFrom, valueTo ] = this.value;
@@ -37,7 +37,7 @@
 
 		mounted() {
 			this.$nextTick(function () {
-				if ($.fn.ionRangeSlider) {
+				if (window.$ && window.$.fn.ionRangeSlider) {
 					let valueFrom, valueTo;
 					if (isArray(this.value)) {
 						[ valueFrom, valueTo ] = this.value;

src/fields/fieldSpectrum.vue

@@ -17,7 +17,7 @@
 
 		watch: { 
 			model() {
-				if ($.fn.spectrum) {
+				if (window.$ && window.$.fn.spectrum) {
 					this.picker.spectrum("set", this.value);
 				}
 			},
@@ -32,7 +32,7 @@
 
 		mounted() {
 			this.$nextTick(function () {
-				if ($.fn.spectrum) {
+				if (window.$ && window.$.fn.spectrum) {
 					this.picker = $(this.$el).spectrum("destroy").spectrum(defaults(this.schema.colorOptions || {}, {
 						showInput: true,
 						showAlpha: true,